ASTM D5808-95
(Test Method)Standard Test Method for Determining Organic Chloride in Aromatic Hydrocarbons and Related Chemicals by Microcoulometry
Standard Test Method for Determining Organic Chloride in Aromatic Hydrocarbons and Related Chemicals by Microcoulometry
SCOPE
1.1. This test method covers the organic chlorides in aromatic hydrocarbons, their derivatives, and related chemicals.
1.2 This test method is applicable to samples with chloride concentrations from 1 to 25 mg/kg.
1.3 This test method is preferred over Test Method D 5194 for products, such as styrene, that are polymerized by the sodium biphenyl reagent.
1.4 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Note 2 and Section 9.
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Designation: D 5808 – 95
Standard Test Method for
Determining Organic Chloride in Aromatic Hydrocarbons
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and Related Chemicals by Microcoulometry
This standard is issued under the fixed designation D 5808; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope OSHA Regulations—29CFR paragraphs 1910.1000 and
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1910.1200
1.1 This test method covers the organic chlorides in aro-
matic hydrocarbons, their derivatives, and related chemicals.
3. Terminology
1.2 This test method is applicable to samples with chloride
3.1 Definitions:
concentrations from 1 to 25 mg/kg.
3.1.1 dehydration tube—a chamber containing concentrated
1.3 This test method is preferred over Test Method D 5194
sulfuric acid that scrubs the effluent gases from combustion to
for products, such as styrene, that are polymerized by the
remove water vapor.
sodium biphenyl reagent.
3.1.2 oxidative pyrolysis—a process in which a sample is
1.4 The following applies to all specified limits in this
combusted in an oxygen-rich atmosphere at high temperature
standard: for purposes of determining conformance with this
to break down the components of the sample into elemental
standard, an observed value or a calculated value shall be
oxides.
rounded off “to the nearest unit” in the last right-hand digit
3.1.3 recovery factor—an indication of the efficiency of the
used in expressing the specification limit, in accordance with
measurement computed by dividing the measured value of a
the rounding-off method of Practice E 29.
standard by its theoretical value.
1.5 This standard does not purport to address all of the
3.1.4 reference sensor pair—detects changes in silver ion
safety concerns, if any, associated with its use. It is the
concentration.
responsibility of the user of this standard to establish appro-
3.1.5 test titration—a process that allows the coulometer to
priate safety and health practices and determine the applica-
set the endpoint and gain values to be used for sample analysis.
bility of regulatory limitations prior to use. For specific hazard
3.1.6 titration parameters—various instrumental conditions
statements, see Note 2 and Section 9.
that can be changed for different types of analysis.
2. Referenced Documents 3.1.7 working electrode (generator electrode)—an electrode
consisting of an anode and a cathode separated by a salt bridge;
2.1 ASTM Standards:
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maintains a constant silver ion concentration.
D 1193 Specification for Reagent Water
D 3437 Practice for Sampling and Handling Liquid Cyclic
4. Summary of Test Method
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Products
4.1 A liquid specimen is injected into a combustion tube
D 5194 Test Method for Trace Chloride in Liquid Aromatic
3 maintained at 900°C having a flowing stream of 50 % oxygen
Hydrocarbons
and 50 % argon carrier gas. Oxidative pyrolysis converts the
E 29 Practice for Using Significant Digits in Test Data to
4 organic halides to hydrogen halides that then flow into a
Determine Conformance with Specifications
titration cell where it reacts with silver ions present in the
2.2 Other Document:
electrolyte. The silver ion thus consumed is coulometrically
replaced and the total electrical work to replace it is a measure
of the organic halides in the specimen injected (see Annex A1).
5. Significance and Use
5.1 Organic as well as inorganic chlorine compounds can
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This test method is under the jurisdiction of ASTM Committee D16 on
prove harmful to equipment and reactions in processes involv-
Aromatic Hydrocarbons and Related Chemicals is the direct responsibility of
Subcommittee D16.04 on Instrumental Analysis. ing hydrocarbons.
Current edition approved Oct. 10, 1995. Published December 1995.
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Annual Book of ASTM Standards, Vol 11.01.
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Annual Book of ASTM Standards, Vol 06.04. Available from Superintendent of Documents, U.S. Government Printing
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Annual Book of ASTM Standards, Vol 14.02. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 5808
5.2 Maximum chloride levels are often specified for process 7.7 Dehydration Tube, positioned at the end of the pyrolysis
streams and for hydrocarbon products. tube so that effluent gases are bubbled through a sulfuric acid
5.3 Organic chloride species are potentially damaging to solution, and water vapor is subsequently trapped, while all
refinery processes.
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